Lawn aeration also helps to decrease the buildup of thatch in your lawn.
Thatch is made up of a layer of dead roots, rhizomes, and lawn clippings that have not been broken down between the surface of the soil and the layer of grass. If this build up of thatch becomes too thick, it soaks up any moisture like a sponge and does not allow the roots to properly affix themselves into the soil.
The root system is not able to get the necessary nutrients it needs to withstand changes in temperature and long-term good health. In addition, excessive thatch provides a breeding ground for pests like chinch bugs, which will harm the lawn even further.